Comment by dofm

Sometimes used as a term in linguistics.

Put it in quotes: "Indian Standard English" and you will see plenty of results.

https://www.google.com/?q=%22Indian+Standard+English%22

https://www.jbe-platform.com/content/journals/10.1075/eww.24...

It doesn't mean a written standard exists.

Maybe it's called Standard Indian English or just Indian English in other contexts; I'm only using a term I've seen used.